Tropism

 

Tropism is when a plant is growing at an angle due to an outside source like the sun or wind.

Even though it may be hard to see, the tree in this photo is growing at an angle due to where the sun hits it. For part of the day the sun is shining on this plant at an angle but because of other trees in this area the sun is never directly above this plant, so it is growing slanted.

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